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Old 4th May 2005, 22:08   #1  |  Link
jeanl
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Problem in DVD2AVI with "emulated SEQUENCE_HEADER_CODE"

Hi guys,
As you may or may not know, the preview part of PgcEdit and Vobblanker uses the original DVD2AVI code that jsoto modified a bit, and which I packaged as a class (called DVDPreview) to be used in, say, MFC apps. This is what PgcEdit and vobblanker (and menushrink) use for their preview.

Recently, blutach found a VOB that simply wouldn't display correctly in the preview (see this). I traced the problem down to a part of the original DVD2AVI code (the function MPEG2Dec(LPVOID n)) where the original author wrote:
Code:
// This code is designed to ignore false (emulated) leading
// SEQUENCE_HEADER_CODEs. But it precludes decoding MPEG1
//  because it would trigger this. I'll wait until I see
// how real the issue is before doing anything. So far it is
// just one VOB reported and the notifier no longer even has
// it.
The problem comes from the fact that DVD2AVI thinks it sees a SEQUENCE_HEADER_CODE, but in fact, it's looking inside a navpack (!), see this to see why that is. Of course, from then on, things don't go really well!
The DVDPreview code is based on version 110 of DVD2AVI. I'm wondering if DGIndex offers a solution to the problem, if other people have encountered the issue, and if there's been a workaround.

In nearly 1 year of use as a preview for vobblanker (and a bit less for pgcedit), I think this is the first time the problem has occurred, so it's not really critical.

I welcome any comments/suggestions!
jeanl
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Old 4th May 2005, 22:58   #2  |  Link
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I replied in the PgcEdit thread.
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